Epheaim hambujer



(No Model.)

. E. HAMBUJER.-

LOOKING DEVICE FOR DOOR KNOBS- No. 413,826. Patented Oct. 29, 1889;

UNITED STATES PATENT OFFICE.

EPHRAIM HAMBUJER, OF DETROIT, MICHIGAN, ASSIGN OR OF ONE-HALF TO ROBERTSTEWART, JR, OF SAME PLACE.

.LOCKING 'DEVICE FOR DOOR-KNOBS.

SPECIFICATION forming part of Letters Patent No. 413,826, dated October29, 1889.

Application filed March 13, 1889. Serial No. 303,185. (No model.)

To all whom it may concern:

Be it known that I, EPHRAIM HAMBUJER, a citizen of the United States,residing at De troit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Looking Devices forDoor-Knobs, of which the following is a specification, reference beinghad therein to the ac companying drawings.

This invention relates to a new and useful improvement in a combineddoor knob and lock; and the invention consists in the construction andarrangement of difierent parts, all as more fully hereinafter described,and then definitely claimed in the accompanying drawings.

Figure 1 is a perspective view of a doorknob provided with my improvedlock. Fig. 2 is a vertical central longitudinal section thereof. Fig. 3is a similar section with the parts of a modified construction. Fig. 4is a detached perspective view of the sliding sleeve.

A is one of the two door-knobs of a doorlock. B is the rose in whichthis knob engages. O is a notch formed in the cup of the rose. D is asliding sleeve on the shank of the knob. E is a projecting tongue on thesleeve adapted to engage into the notch O of the rose. F is a slot inthe sleeve, and G is a projecting pin or screw-head on the shank of theknob engaging into the slot F of the tongue into the notch O of therose, and

thereby prevents the door-knob from being turned, thus preventing thedoor from being opened; but when the, sleeve is drawn'back upon theshank the knob is again released and operates in the usual manner. Toprevent the accidental displacement of the sleeve when it is not to beused, the slot F is provided with an offset F, for the purpose ofpreventing the sleeve from sliding on the shank by engaging the pin orscrew-head G into said offset.

My device can be readily constructed as an attachment to all kinds ofdoor-locks, 4

provided with a latch operated by the ordinary door-knobs. It dispensesentirely with the use of a key tolock the door on the inside. It is sosimple that its operation is readily understood, and, further, it issecure. The only means for unlocking it surreptitiously from the outsidewould be to remove the outside door-knob and push the spindle backsufficiently to disengage the lockingsleeve from the rose. To preventthis being done, I preferably provide a safety-catch, such as shown inFigs. 2 and 4, or as shown in Fig. 3. The former construction consistsof a latch or dog H, attached to the sliding sleeve, and a suitablekeeper or hook I, secured to the rose, all so arranged that in pushingthe sleeve into its locking position the dog H engages with the keeper.By using a gravity-dog and applying it on the under side of the shank itoperates automatically in closing and in opening. The disengaging of thedog from the keeper is accomplished by taking hold of the sleeve, as inthe natural manner required to withdraw the sleeve.

In the modificationshown in Fig. 3 the dog H is secured to the rose andthe keeper 1' to the sliding sleeve. It is obvious that instead of agravity-dog a spring-dog, as shown in Fig. 3, may be used.

What I claim as my invention is 1. In a combined door knob and lock, thecombination, with the shank of the knob, of the sliding sleeve D,provided with the tongue E, the longitudinal slot F, provided with theoffset F, the pin or screw G on the shank of the knob engaging into saidslot, and the notch 0, formed on the cup of the rose, substantially asdescribed.

2. In a combined door knob and lock, the combination of the sleeveslidingly secured on the shank of the knob and provided with aprojecting tongue, and a notch formed on the rose, into which saidtongue is adapted to engage, and a latch or dog and a keeper independentof said tongue and respectively attached to the sliding sleeve and therose, substantially as described.

In testimony whereof I affix my signature, in

presence of two witnesses, this 6th day of

